He is living in ________ used to be a store. [ ]
A. where
B. that
C. which
D. what
答案:D
下面ChangeTitle()中对b1和b2按钮构造监听器,实现当单击b1按钮时标题变为students,当单击b2按钮时标题变为Teachers。请将程序补充完整。 public ChangeTitle() { super("Title Bar"); b1.addAetionListener(this); 【15】 Jpanel pane = new Jpanel(); Pane.add(b1); Pane.add(b2); SetContentPane(pane); public void actionPerformed(ActionEvent evt) { Object sourve = evt.getSource(); if (sourve ==b1) setTitle("Students"); else if (source == b2) setTitle("Teachers"); repaint(); }
用行扫描法查找按动的键时,若在一次扫描结束后,出现两个以上的_________出现在行列代码中,说明________产生。